DYFJ-C1200 Type Valve Test Bench

The DYFJ-C1200 valve testing bench is the fourth-generation pressure testing and inspection equipment independently developed by Duojia Hydraulics, based on years of production experience and in accordance with national standards and specifications.

The DYFJ-C1200 type valve test bench integrates mechanical and electrical systems, hydraulic systems, pressure testing, and the storage and recycling of liquid mediums. It features comprehensive functions, stable performance, and high automation. It is widely used for sealing surface leakage tests and shell strength (pinhole) tests of various high, medium, and low-pressure valves with nominal diameters of 600-1200mm, in the form of straight-through flanges. Test media: water, gas, oil.

The equipment is driven by hydraulic power and controlled by electricity, with no external forces affecting the valve's test results, which greatly enhances work efficiency and reduces labor intensity. It is an ideal new generation pressure testing and inspection equipment for valve manufacturing companies, users, and maintenance units.

DYFJ-C1200 type valve test bench working principle and structure

The DYFJ-C1200 valve test bench operates by positioning the valve flange and clamping the back of the flange with a live paw, ensuring no external forces that could affect test results. It meets the national standard requirements for valve testing.

The equipment is broadly categorized into hydraulic pressure supply systems, electrical control systems, water circulation systems, and various operating devices.

The equipment features a diving double flip design, with each workbench (left and right) sealed with a blind flange. The left workbench is equipped with an in/out mechanism, directly driven by a hydraulic cylinder, ensuring uniform force distribution on the valve sealing surface and reliable clamping. Both left and right workbenches can be flipped 90 degrees, and the entire workbench surface can be submerged into the external water tank, allowing the valve to be fully immersed in water for easy inspection of the gas-tightness test and observation of the valve sealing surface. It boasts excellent performance and a simple, compact structure.

Technical Specifications

Operation Instructions

1. Valve Mounting Method

Select a valve with the nominal diameter that matches the equipment model, turn on the power, and start the hydraulic system. Move the left sliding frame back to a position longer than the valve being tested. Radially move the movable clamp to a diameter larger than the valve flange outer diameter, and extend the clamp axially to a thickness greater than the valve flange. Place the valve flange face tightly against the left workbench test blind plate, aligning with the center hole. Radially move the clamp close to the valve flange, and axially move the clamp to ensure it snugly contacts the back of the valve flange. At this point, the valve should be securely clamped and fixed by the left clamping system, ensuring the valve will not come loose.

The left-hand moving bracket advances towards the right-hand fixed workbench, with the other end of the valve being tightly sealed against the right-hand pressure test blind flange, aligned with the center hollow space. Radially move the clamping jaws close to the valve flange; axially move the jaws to make them adhere to the back of the valve flange. At this point, the valve should be securely gripped and fixed by the right-hand clamping system, with the valve in an overall horizontal position.

2. Water Pressure Testing Methods (Double-direction Inflow and Drainage)

After the valve mount is completed, refer to the "Clamping Cylinder Pressure Chart" to increase the hydraulic clamp's gripping force to the required pressure. Adjust the electrical contact pressure gauge (for a 25 kg valve, adjust the gauge pointer to 2.5 MPa). Open the main water intake, left and right water intake valves, close the air intake, drain, and vent valves. Start the low-pressure water pump, observe the movement of the water pressure gauge pointer. When the pointer stops rising, it indicates that the valve cavity is fully filled with water. Start the high-pressure water pump; the pump will automatically stop when the water pressure reaches the set pressure on the electrical contact pressure gauge. The equipment then enters the water pressure maintenance state.

Upon reaching the pressure-holding time, the valve is free of any issues. First, open the water valve to relieve the pressure inside the valve chamber, and then remove the valve.

3. Pressure Test Methods (Bidirectional Intake, Exhaust)

The equipment does not come with its own gas source. The user must provide a separate gas source. Please consult the manufacturer before using high-pressure gases.

After the valve mounting is complete (for example, using pressure air, generally not exceeding 10 kg), open the inlet and air inlet valves, and close the drain and air drain valves. Close the inlet and air inlet valves when the pressure gauge reaches the highest pressure, and the equipment is in a pressure maintenance state.

Upon reaching the pressure-holding time, there are no issues with the valve. First, open the vent valve to release the pressure inside the valve chamber, and then remove the valve.

Usage Precautions and Requirements

1. Ensure the equipment is level during installation or use concrete to secure the anchor groove steel.

2. Use 46-grade anti-wear hydraulic oil (use antifreeze 46-grade anti-wear hydraulic oil below 0℃), ensuring the oil level is not below the gauge's lower limit. Regularly check the oil level and hydraulic oil. After one year of use, clean the oil tank and replace the hydraulic oil.

3. Add anti-rust powder to the recirculating water, and replace it promptly when the water quality deteriorates.

4. The equipment work surface should be kept clean, and there should be no debris between the test valve flange and the test pressure blank flange.

5. Add lubricant to all moving parts of the testing bench to maintain clean and smooth operation.

6. Operators must undergo professional training before starting work, adhere to standardized procedures, and prioritize safety.